pottle



UNITED STATES PATENT OFFICE.

GEORGE E. POTTLE, OF BOSTON, ASSIGNOR OF TWO-THIRDS 'IO WARREN S. HILL, OF HYDE PARK, AND ROYAL O. STORRS, OF DEDHAM, MASS.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 317,670, dated May 12, 1885.

Application filed November 28, 1883. (No model.)

T0 all whom it may concern:

Be it known that LGEORGE FRANK POTTLE, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Wrenches, of which the following is a specification.

My invention relates to that class of w renches which are called self-gripping77 wrenches, and has for its object to make the wrench more automatic in its action and of increased strength and durability. These objects I attain by the mechanism illustrated in the accompanying drawings, in which- Figure 1 shows my invention in elevation. Fig. 2 shows the same in section. Fig. 3 shows in detail a spiral spring and a protectingthimble.

The shank A A and the fixed jaw B, together with the handle C of my wrench, are made in the usual manner. The screw-nut D works on the shank A', as shown, and is provided with a groove, K, near one end, into which ts a projection, H, of the housing E. The movable jaw M is connected to the hous ing E by the pivot V, Figs. 1 and 2, so that it may swing down and toward the jaw B as the strain is applied to it.

S, Fig. 2, is a spring placed Within and under the jaw M, and serves to throw it up.

L is a projection from the movable jaw IWI, 3o

T is a thimble partially inclosing the spring 4o S, its object being to protect the spring from dirt, dust, Ste., and also to secure its more perfect action.

I claim- The movable jaw M, provided with the pro- 4 5 jection L, in combination with the pivot V, the housing E, and adjustingscrew D, all arranged andconstructed substantially as described, and for the purpose set forth.

GEORGE F. POTTLE.

Vitnesses:

HELEN M. FEEGAN, CHAs. SPAULDING. 

